It says, "[Up] [Down] [Up] [Right] will shut it down." We found it blowing in the wind in the Carnea District.
Using the command "[Up] [Down] [Up] [Right]", Ein shut down two enemy Golems.
Golem Manual

Golem Manual is an Event Item in Riviera: The Promised Land that can be used to avoid two Golem encounters in the Tetyth stage.

Acquirement: In the final room of Tetyth's Carnea District, upon defeating the Elder Wyrm, attempting to advance will trigger a minigame event. Complete it successfully to obtain the manual.

Function: Allows for the Golem encounters in Stage 4 to be avoided via manual input, but only if the code is memorized by viewing the item's description in the Inventory. The input command is only effective during this stage.

Community content is available under CC-BY-SA unless otherwise noted.